Water-tube boiler.



No. 669,.77I. Patented Mar. 12, I90I.

" E. R. STETTINIUS;

WATER TUBE BOILER. (A P1168 fil d F 'b 28 1 0 v (Flo Model.) 2Sheets-Shaet l.

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E. n. STETTINIUS. WATER TUBE. BOILER. (Application fllad Feb. 28, IQOOJA} Eyi,

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NTTED STATES PATENT OFFI E.

EDWARD R. S'IETTINIUS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE STIRLINGCOMPANY, OF SAME PLACE.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent N 0. 669,771. dated March12, 1901. Application filed February 28, 1900. Serial No. 6,841. (Nomodel.)

T0 at 21/77/071 it may concern;

Be it known that I, EDWARD R. STETTINIUS,

a citizen of the United States, residing at Chicago, in the county ofCook and State of Illinois, have in vented a new and usefulImprovementin Water-Tube Boilers, of which the following is aspecification.

The object of my invention is to improve the vertical water-tn be boilerof the type commonly known as the Stirling boiler; and the inventionconsists in the features and combinations hereinafter described andclaimed.

In the accompanying drawings, Figure l is a cross-sectional elevation ofmy improved boiler,the circulating-pipe being shown in dotted lines;Fig. 2, a longitudinal sectional elevation of part of the boiler,showing one of the circulating-pipes embedded in the wall or setting;Fig. 3, a longitudinal sectional elevation showing the circulating-pipesinside the wall or setting; and Fig. 4:, a longitudinal sectionalelevation showing the circulating-pipes outside the wall or setting.

A, A, and A are elevated steam and water drums, a, pipes communicatingbetween the steam-spaces thereof, and a pipes communicating between thewater-spaces thereof; B, lower mud-drums; 0, banks of tubes connectingthe elevated steam and water drums with the lower mud-drums; D,circulating-pipes connecting the ends of the rear elevated steam andwater drum with the ends of the front lower mud-drum; E, the fireplace,and e a fire-brick arch over the same, and F firebrick partitions inrear of and adjacent to the front and middle banks of tubes,respectively.

The Stirling type of boiler, to which my in vention relates, is so wellknown that I do not consider it necessary to describe its constructionor operation in detail. In this view, and because they are clearly shownin the drawings, no description is considered necessary of the elevatedsteam and water drums and connecting-pipes, lower muddrums, banks oftubes connecting the lower mud-drums with the elevated steam and waterdrums, fire-brick arches and partitions, and other features in commonuse as parts thereof. In addition to these parts or features,

however, I provide special circulating-pipes between the rear elevatedsteam and water drum and the front lower mud-drum, whichcirculating-pipes communicate with these drums at or near their ends,respectively, and are embedded in the wall or setting of the boiler orplaced inside or outside thereof, as desired. In Fig. 2, whichillustrates only a part of the boiler, one of these circulating pipes isshown as embedded in the wall or setting. In Fig. 3 the twocirculating-pipes are shown inside the wall or setting and in Fig. 4outside the wall or setting. As already stated, these pipes communicatewith the end portions of the drums to which they are attached,respectively; but their connections are not necessarily at the extremeends of the drums, connection near the ends being suificient. As shown,feed-water is to be introduced into the rear mud-drum; but it may beintroduced into the rear elevated steam and water drum or elsewhere asdesired.

In filling, the feed-water being introduced into the rear mud-drumpasses up through the rear and middle banks of tubes into the rear andmiddle elevated steam and water drums, and from the rear elevated steamand water drum it passes down through the circulatingpipes to the frontmud-drum and thence up through the front bank of tubes to the frontelevated steam and waterdrum also, from the middle elevated drum throughthe connectingpipes to the front steam and water drum. In operation thefront bank of tubes beingin the hottest part of the boiler the mostrapid up- Ward circulation will be through this bank; but thecirculating-pipes permit a constant downflowand supply of water to takethe place of water converted into steam in this bank of tubes and alsothe place of water passing from the front steam and water drum into themiddle steam and water drum or elsewhere. The water-spaces of theelevated steam and Water drums communicating with each other, waterpasses from one drum to the other as required bycirculation and otherconditions. In other words, the circulating and connecting pipes providefor a powerful circulation of water up through the front bank of tubesand across from the front steam and water drum to the middle and rearsteam and water drums and down to the front mud-drum,

and so on in circuit, the practical effect being that the tubes of thefront bank are more completely filled with cooler Water or water freefrom steam and the transmission of heat in this bank thereby greatlyincreased. 00- incident with this primary circulation there is also asecondary circulation of the feed-water up through the middle bank oftubes to the middle steam and water drum, thence across to the rearsteam and water drum and v down through the rear. bank of tubes, and soon in circuit, this circulation serving to heat the feed-water andthereby provide for separation and a settlement of scale-forming matterin the rear and cooler parts of the boiler. If feed-water be introducedin the rear or middle steam and water drum or elsewhere in the rear partof the boiler, the circulation will be practically unchanged.

The circulating-pipes being of larger diameter than the diameter of thetubes of the several banks and being located in a comparatively coolpart of the boiler provide for a constant and abundant supply of waterfrom the rear part of the boiler to the front part and this Withouthaving serious counter currents in the tubes furnishing theheating-surface and primarily intended tor the generation of steam.

Although I have shown and described one circulating-pipe at each end ofthe boiler, it will be understood that one or more may be used, asdesired. It will also be understood that instead of twocirculating-pipes, one at each end, a single circulating-pipe may beused at one end only.

I claim 1. In a water-tube boiler, the combination of a front elevatedsteam and water drum, a middle elevated steam and water drum, a

rear elevated steam and water drum, pipes communicating between thesteam and the Water spaces of said drums respectively, a front lowermud-drum,a rear lower mud-dru m, banks of tubes connecting the rearmud-drum with the middle and rear steam and water drums respectively, abank of tubes connecting the front mud-drum with the front steam andwater drum, a circulating pipe or pipes at or near the ends andcommunicating between the rear steam and water drum and the frontmud-drum, located in cool relation to the boiler-setting and giving anauxiliary circulation at the end between the two drums, means forintroducing feed-water, and means for drawing off steam, substantiallyas described.

2. In a water-tube boiler, the combination of a front elevated steam andwater drum, a middle elevated steam and water drum, a rear elevatedsteam and water drum, pipes communicating between the steam and thewater spaces of said drums respectively, a front lower m ud-d ru m,arear lower mud-drum, banks of tubes con necting the rear m ud-d ru inwith the middle and rear steam and water drums respectively, abank oftubes connecting the front mud-drum with the front steam and water drum,a circulating-pipe at each end of and communicating between the rearsteam and water drum and the front muddrum and giving an auxiliarycirculation between the two drums, each pipe embedded in the boiler Wallor setting, means for introducing feed-water, and means for drawing of]?steam, substantially as described.

EDWARD R. STETTINIUS.

Witnesses:

FRANK O. WAGNER, THOMAS B. MCGREGOR.

